Same thing where I live, you can't legally park more than one week at the same place (public place). Cops put some paint marks on ground and tires to see if vehicle has moved, if it hasn't after a week, then you're fined and vehicle is seized. Of course it happens rarely and only on crowded area, but it is a gerenal rule all over the country.
Sorry it can't help you. In the other hand, in private/semi public place we use giant stickers "no parking" on vehicle glasses, usually it works. You can also use some sharpie to put various inscriptions on the car itself...depend on you
I only used some giant stickers once in my life, at work when some douche parked for two days in the firemen entrance - safety measure since it was blocking all firemen access in case of emergency.
Another time was at friend's place, some drunk girl parked after a heavy party her Renault Twingo preventing 3 cars to move. Friend had to go to work, so we towed the Twingo for like two meters, so that he could go out of his place. Lucky for us it was just a Twingo!
Good luck with your neighbours, sometimes not the easiest aspect of living in community.